Combine multiple PDF files into a single document. Drag to reorder before merging. All processing happens in your browser.
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Merging PDFs...
Combine multiple PDF documents into one file in three simple steps. No software to install, no account to create.
Drag and drop all the PDF files you want to combine into the upload area, or click the upload button to browse your device. You can select as many files as you need in a single batch — there is no limit on the number of documents you can add. Each file is loaded directly into your browser without being sent to any external server.
Once your PDFs are uploaded, you will see a thumbnail preview of each file. Simply drag and drop the thumbnails to arrange them in the exact order you want. The final merged document will follow this sequence — first file becomes the first set of pages, second file comes next, and so on. Take your time to get the order right before merging.
Click the "Download Merged PDF" button and the tool will instantly combine all your files into a single PDF document. The merged file is generated entirely in your browser and saved directly to your device. All pages, text, images, and formatting from every source file are preserved exactly as they appeared in the originals.
A fast, private, and completely free way to combine PDF files online without any limitations.
Merge as many PDF files as you need without any cost. There are no premium plans, no daily limits, no per-file charges, and no trial periods. Every feature of the PDF merger is available to everyone, always.
Your documents never leave your device. All PDF merging happens entirely in your web browser using JavaScript and the pdf-lib library. We cannot see, access, or store your files at any point during the process. Your sensitive documents stay private.
Easily rearrange your PDF files by dragging and dropping thumbnails into the desired order. You have full control over the final document structure before you merge, so the combined PDF is organized exactly the way you want it.
The merge process copies every page from each source PDF exactly as it is. All text, images, fonts, vector graphics, form fields, annotations, and page layouts are preserved perfectly in the final combined document. Nothing is altered or degraded.
There are no restrictions on the number of PDFs you can combine or the size of individual files. Since processing is handled locally in your browser, the only constraint is your device's available memory. Most modern devices handle large merges effortlessly.
Your merged PDF is clean and professional. We never add watermarks, branding, or any other markings to your output files. The final document looks exactly as if you had combined the files using premium desktop software.
Everything you need to know about combining PDF documents, from common use cases to technical details.
Merging PDF files is one of the most common document tasks for professionals, students, and everyday users. Whether you are combining quarterly financial reports into a single annual summary, merging signed contracts with their appendices and exhibits, or assembling a design portfolio from multiple project files, having a reliable PDF merger saves significant time and effort. Teachers often need to combine assignment sheets, rubrics, and reference materials into one handout. Legal teams merge discovery documents, pleadings, and evidence into unified court filings. Real estate agents combine property disclosures, inspection reports, and purchase agreements into complete transaction packages. In every case, the goal is the same: take separate PDF documents and produce a single, well-organized file that is easy to share, print, and archive.
ConvertKr's PDF merger uses the pdf-lib JavaScript library to combine your documents entirely within your web browser. When you upload PDF files, each document is read into memory as binary data. The tool then creates a new, blank PDF document and copies every page from each source file into it, maintaining the exact order you specify through the drag-and-drop interface. This page-level copying process preserves all content on each page, including text, images, vector graphics, fonts, and annotations. The process is non-destructive — your original files remain completely untouched. Because everything runs in your browser, there is no server-side processing, no network transfer of your documents, and no waiting in a queue. The merge happens instantly on your machine.
When merging PDF files, page-level content such as text, images, form fields, and annotations are always preserved faithfully. Each page in the merged document is an exact copy of the corresponding page in the source file. This means that any hyperlinks, embedded images, tables, charts, and interactive form elements on individual pages carry over into the combined document. The visual appearance and layout of every page remain identical to the original. For documents with complex formatting — such as reports with headers, footers, and page numbers, or presentations with detailed graphics — the output will match the source files precisely.
The order in which PDF files are merged matters. ConvertKr gives you full control over the sequence through an intuitive drag-and-drop interface. After uploading your files, you see a visual grid of thumbnails representing each document. Simply grab a thumbnail and drag it to a new position to change the order. This is especially useful when you are combining chapters of a book, sections of a report, or pages from different sources into a cohesive document. For instance, if you are preparing a proposal, you might want the cover letter first, followed by the executive summary, technical specifications, pricing breakdown, and finally the terms and conditions. The drag-and-drop reordering ensures your final document flows logically from start to finish without any confusion. You can also add more files after your initial upload and position them anywhere in the sequence before clicking merge.
Business professionals frequently merge PDFs when preparing board meeting packets, combining invoices for expense reports, or assembling training manuals from individual module documents. Students and researchers merge lecture notes, research papers, and reference materials into comprehensive study guides. Freelancers and creative professionals combine portfolio pieces, case studies, and testimonials into a single presentation document for clients. Government and legal professionals merge regulatory filings, compliance documents, and supporting evidence into unified submissions. Healthcare administrators combine patient intake forms, consent documents, and medical records into complete patient files. The versatility of PDF merging makes it an essential tool across virtually every industry and workflow.
For the smoothest merging experience, make sure all your PDF files are finalized before combining them. If any documents need editing — such as correcting text, rotating pages, or removing blank pages — use the PDF Editor or Split PDF tool first. Name your files descriptively before uploading so you can easily identify them in the thumbnail grid. If you need to merge a large number of documents, consider grouping related files and merging them in batches, then combining the batched results into a final document. After downloading your merged PDF, open it to verify that all pages appear in the correct order and that the content looks as expected.
Common questions about merging PDF files with ConvertKr.
There is no hard limit on the number of PDF files you can combine. Since all processing happens in your browser, the practical limit depends on your device's available memory and processing power. Most modern computers and tablets can handle merging dozens of PDF files without any issues. If you are working with an exceptionally large number of files, try merging them in smaller batches.
Yes. Every single page from every uploaded PDF file is included in the final merged document. The tool copies all pages in their entirety — no pages are skipped, cropped, or modified during the merge process. If you need to exclude specific pages, use the Split PDF tool first to extract only the pages you want, then merge those extracted files.
Absolutely. After you upload your PDFs, the tool displays a thumbnail grid where you can drag and drop files to rearrange them in any order you want. You can also add additional files at any time and position them anywhere in the sequence. The final merged document will follow the exact order shown in the grid.
Yes. All PDF merging happens entirely in your web browser using JavaScript. Your files are never uploaded to any server. ConvertKr cannot see, access, or store your documents at any point during the process. Once you close the browser tab, all data is cleared from memory. This makes the tool safe for confidential, legal, financial, and personal documents.
No. The merge process is lossless. Each page is copied directly from the source PDF into the new combined document without any re-rendering, re-compression, or quality degradation. Text stays sharp, images maintain their original resolution, and vector graphics remain fully scalable. The output quality is identical to the input quality.
Page-level content including embedded hyperlinks, form fields, annotations, and interactive elements on individual pages are preserved in the merged document. The page content is copied exactly as it appears in the original files, so any links or form fields that exist on specific pages will continue to work in the combined PDF.
Yes. The PDF merger is fully responsive and works on smartphones, tablets, laptops, and desktop computers. Any device with a modern web browser — including Chrome, Safari, Firefox, and Edge — can use the tool. The drag-and-drop reordering is touch-friendly, so you can rearrange files on a phone or tablet just as easily as on a desktop.
ConvertKr does not impose any file size restrictions. Since processing is handled locally in your browser, the maximum file size depends on your device's available RAM. Most modern devices handle individual PDFs up to 100 MB and combined totals well beyond that without issues. For very large files, ensure you have sufficient free memory and close other browser tabs to free up resources.
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